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After a console has been selected, the console-selection sequence is only started at
boot time if there is a change in the system configuration (as described above), or the
contents of the system's nonvolatile memory (NVRAM) are lost.
Note: Moving an ASCII terminal from one serial port to another (from S1 to S2) cannot
You can also initiate a system console-selection sequence from the SMS menus.
Power-On Self-Test
After power is turned on and before the operating system is loaded, the system does a
power-on self-test (POST). This test performs checks to ensure that the hardware is
functioning correctly before the operating system is loaded. During the POST, a POST
screen displays, and POST indicators appear on the firmware console (if one is
connected). The next section describes the POST indicators and functions that can be
accessed during the POST.
POST Indicators
POST indicators indicate tests that are being performed as the system is preparing to
load the operating system. The POST indicators are words that display on the system
console. Each time that the system starts a different step in the POST, a POST
indicator word appears on the console. Each word is an indicator of the tests that are
being performed.
The POST screen displays the following words:
Memory
Keyboard
Network
SCSI
Speaker
POST Keys
The POST keys, if pressed after the keyboard POST indicator displays and before the
last POST indicator speaker displays, cause the system to start services or to initiate
service mode boots used for configuring the system and diagnosing problems. The keys
are described below:
Note: The program function keys (F1-F12) on a keyboard attached to the I/O drawer
6
Service Guide
be detected by the firmware, so it does not constitute a configuration change.
Memory test
Initialize the keyboard and mouse. The time period for pressing a key
to access the System Management Services, or to initiate a service
mode boot is now open. See "POST Keys" for more information.
Self-test on network adapters
Adapters are being initialized
Sounds an audible tone at the end of POST
are not used and will be ignored. After the keyboard POST indicator displays,
you must use the numeric number keys to enter input.
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